Grinding-mill.



PATENTED JAN. 24, 1905.

W. RIEP.

GRINDING MILL. APPLICATION FILED 00127, 19o`a.

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surface of the cylinder. A not have sharp edges.

Patented .J anuary 24, 1905.

PATENT OFFICE.

WILHELM BIEF, OF HAMEURG, GERMANY.

GRINING-MIL'L.

SPECIFIGATIONforming part of Letters Patent No. 780,729, dated January 24, 1905.

` Application led October '7, 1903. Serial No. 176,138.

To allA whom it may concern:

Be it known that I, WILHELM RIEF, electrician, a resident of the free town of Hamburg,

German Empire, have invented certain new and useful Improvements in Grindlng-Mill's,

the so-called millstone or Crusher, but

which is of metal. This crusher g closes one end of the cylinder a, While at the other end the grain or material to be ground is introduced from the hopper f. The said grooves run parallel vwith the axis of the cylinder or are wound spirally. By this grooving the grain is -prevented to glide along the inner The grooves need There will therefore be no necessity of sharpening the edges, as they cannot get more blunt than they are. In the wall of the cylinder are provided holes L, which widen toward the outside. v

The-Crusher g'consists of a nave or hu Y ixed on'a shaft c of a motor and possessing two or more arms c, which are united by a ring 7c. The arms e are of such a cross-section that without touching the cylinder they form hollow spaces with it of a wedge-shaped cross-section and in which the grain held by the grooves is crushed in the rotation'. The

arms e are for this purpose so arranged that while the one leaves at its near edge a small passage free the other brushes close along the Wall of the cylinder and presses theground grain outside through the holes 7L. For grinding roasted coffee-berries it has proved the most practical to have the holes of a width of about two millimeters. For grinding chalk, limestone, cement-clinker, and such like the width of the holes should correspond with the size of the grains desired;y In order that the material to ybe. ground may not stick fast in the holes la, they widen toward the outside.

The invention admits of a diversity in the number as well as in the shape' of the arms and grooves. v

What I claim as my invention, and desire to secure by Letters Patent of the United States, is-

The combination, in a grinding or crushing mill, with aV hollow cylinder a, having holes widening toward the outside, of a crusher or grindstone g, fitted on the shaft of the motor and rotating with great speed inside the former, said cylinder a being provided with grooves on its inside and said crusher possessing arms which form with the cylinder wedgeshaped hollow spaces, one of said arms being adapted to crush the material to be ground,l especially coffee, in said hollow spaces, whereas the other arm is adapted to press it out through the holes t in the wall of the cylinder, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specilication in the presence of two subscribing witnesses.

WILHELM RIEE.

Witnesses:

JOHANN HINNIs BIEF, T. A. Nuns. 

